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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

The biodegradation potential of the test substance was determined in accordance with the OECD Guideline for Testing of Chemicals 301B. The test substance was tested for ready biodegradability using activated sludge of a sewage treatment plant receiving predominantly domestic sewage. The test was conducted over a period of 28 days. After 28 days the biodegradation of the test substance was recorded as 64% (based on CO2 evolution).The 10-day-window began on day 9, at its end, 45% degradation were reached, missing the pass level of 60% given in the OECD guideline. As degradation reached the pass level of 60% in the course of the test, ASCplus® is considered as ultimately biodegradable, within 28 days.


The analytical determinations indicate a degradation of the test item ASCPlus® and in parallel an increase of the metabolite 4-aminobutyric acid (ABA). The metabolite 4-N-p-Tosylglycine is produced only in minor concentration toward the end of the test. The measured test item and metabolite concentrations support the CO2 evolution data.


An additional study was conducted on a formulated product containing the registered substance to determine the inherent biodegradability of the formulated product. The inherent biodegradability of the test material was determined in accordance with the OECD Guideline for Testing of Chemicals 302B. The biodegradation of the substance was measured by COD analysis. 0.1825 ml/l (equivalent to 142.9 mg/l COD) of test substance was added to test vessels containing 357.1 mg/l of activated sludge. The final 56 day degradation value was determined to be 78.6% at 0.1825 ml/l of test substance. From the results of this study it can be concluded that p-TSA Triethanolamine salt does not meet the criteria for classification as 'inherently biodegradable' according to the OECD 302B method, with >70% biodegradation being achieved within the 56 day test period. The test material shows good potential for ultimate biodegradation under the conditions of this study.

Additional information

In addition, a formulated product containing the registered substance was found to show good potential for ultimate biodegradation, but was not considered to be inherently biodegradable. A formulated product containing the registered substance showed a low potential for biodegradation in seawater, with 28 day degradability rates of 29.6% at 2.5 mg/l and 22.1% at 3.5 mg/l. The test material was considered ultimately biodegradable but not readily biodegradable in seawater.

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